Drop garbage uploads early (D42)

Random-named uploads that never get a real name or password were ~90% of
what seeding stores. Two filters:

- before storing (seeding, ingest): random-named uploads of a dropped
  signature (posting tool from the Message-ID, first group) or of a
  release dropped after its probe aren't stored; 2% of a dropped
  signature's releases are still kept and probed. Stored files of dropped
  signatures aren't probed.
- after a probe: a random-named release that is still unnamed, without
  password, names from files or spot, with all its probes done, and
  encrypted, a container or missing its first article, is deleted and
  tombstoned in dropped_releases.

Signatures are learned by gc:scheduler from a sample of probed releases
(signature_probes); garbage:learn --seed fills it from existing files.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

commands/SeedRange.ts

@@ -51,7 +51,7 @@ export default class SeedRange extends BaseCommand {
     const first = Number(this.start)
     if (!Number.isSafeInteger(first) || first < 1) throw new Error(`--start must be an article number, got ${this.start}`)
     const last = first + this.count - 1
-    const stats = { headers: 0, obfuscated: 0, deferred: 0, complete: 0, files: 0, existing: 0, fragments: 0, inspections: 0 }
+    const stats = { headers: 0, obfuscated: 0, deferred: 0, complete: 0, files: 0, existing: 0, dropped: 0, fragments: 0, inspections: 0 }
     let storeMs = 0
     const cpuStart = process.cpuUsage()
     const started = Date.now()
@@ -90,6 +90,7 @@ export default class SeedRange extends BaseCommand {
             storeMs += Date.now() - t
             stats.files += stored.files
             stats.existing += stored.existing
+            stats.dropped += stored.dropped
             stats.inspections += stored.inspections
           }
           this.progress(stats, started)
@@ -106,7 +107,7 @@ export default class SeedRange extends BaseCommand {
     this.logger.info(
       `${this.group} ${first}-${last}: ${n(stats.headers)} headers in ${seconds.toFixed(0)} s (${n(Math.round(stats.headers / seconds))}/s). ` +
         `${n(stats.obfuscated)} obfuscated, ${n(stats.deferred)} deferred. ` +
-        `${n(stats.complete)} complete files (${n(stats.files)} new, ${n(stats.existing)} known), ` +
+        `${n(stats.complete)} complete files (${n(stats.files)} new, ${n(stats.existing)} known, ${n(stats.dropped)} garbage), ` +
         `${n(stats.fragments)} fragment segments, ${n(stats.inspections)} queued for inspection.`
     )
     this.logger.info(`Store ${(storeMs / 1000).toFixed(0)} s; node CPU ${((cpu.user + cpu.system) / 1e6).toFixed(0)} s.`)